HY8:AOP SS Input Reach Data

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AOP Stream Simulation, Input Reach Data



Determine the lowest and highest flow that will still require aquatic organism passage. The lowest flow allowed is 1 cfs. Specify the flow directly, or if the flow has already been entered in the Culvert Input Data dialog, select the flow in the drop down menu. If multiple flows are below 1 cfs, then the list will have "1 cfs" multiple times, but will not cause any computational issues. HEC 26 provides guidance on determining these flows in Chapter 5.

Then determine the hydraulic design flow, which is the design flow used to design the culvert crossing. It is used to determine that the embedment will be stable.

Cross Sections

HY-8 will use the culvert length to determine the length upstream and downstream that the cross sections need to cover. Enter three cross sections upstream and three cross sections downstream. More cross sections will give HY-8 more information to compare.

Cross Section Table

Enter the name of each cross section (or leave it with the default name), must enter the station, then define the geometry of the cross section. Note that HY-8 has now been updated to allow entering the 'site data' in the Culvert Crossing Input Data dialog in ascending or descending order, and this table will need to follow the same order that was entered in the Culvert Crossing Input Data dialog.

Save To File

The Save To File button is available on all pages of the AOP dialog. If having not already saved or loaded from a file, HY-8 will prompt to specify a filename. Otherwise, HY-8 will update the filename already in use. It is recommended to save often.

Data Validation


When the user moves to another step of the AOP Stream Simulation, HY-8 will check the input for any errors. If they are detected, a dialog will pop up with a list of errors and the category they belong to. These errors must be corrected before you can continue to a new step.